class_docstr: Abstract logical operator for `from_*`.
class_docstr_tok: ["Abstract","logical","operator","for","`","from_","*","`","."]
code: def input_data(self) -> List[RefBundle]:
      return self._input_data
  
file_path: ray/python/ray/data/_internal/logical/operators/from_operators.py
imports: import abc
  from typing import TYPE_CHECKING, List, Union
  from ray.data._internal.execution.interfaces import RefBundle
  from ray.data._internal.logical.interfaces import LogicalOperator
  from ray.data.block import Block, BlockMetadata
  from ray.types import ObjectRef
label_desc: Use image node_id 2 for calling the AbstractFrom obj's underlying member method code with example usage: obj.input_data() and returns: self